Copy-protected optical recording medium and a method for manufacturing thereof

ABSTRACT

A copy-protected optical recording medium and a method for manufacturing thereof is provided, wherein the medium has at least two auxiliary sections for confusing control of a copying machine.

TECHNICAL FILED

[0001] The present invention relates to a copy-protected opticalrecording medium on/from which digital contents such as audio contentsrecorded/reproduced and a method for manufacturing thereof, and moreparticularly to an optical recording medium prevented from being copiedby manipulating control information in a lead-in area and a method formanufacturing thereof.

[0002] The present invention relates to an optical recording medium,which is or will be in existence, such as an audio compact disc, acombination of compact discs, a compact disc including other opticalrecording medium and a compact disc included in other optical recordingmedium.

BACKGROUND ART

[0003] As known so far, the optical recording medium storing informationon one side or both sides of it has been used for various purposes,especially in music, game, video and computer industries. Digitalinformation is stored in a form of pits with a predetermined size andinterval along the tracks formed on one side or two sides of the disc.

[0004] According to “copy managing system of an optical disc”(KoreanPatent Application Publication No. 1999-23961), one of the methodsalready known, manufacturing an optical recording medium as mentionedabove, a glass master first is formed by exposing a photoresist spreadover a glass substrate using a laser or light. The exposed patterncorresponds to the pattern of the digital information stored in the disclast.

[0005] Then an indentation, which is called a pit, is formed in thesingle spiral of the glass master by removing the exposed area throughetching or developing process. The pattern and length of the indentationalong the tracks represent the recorded information digitally. And anickel master, which is a tool for molding duplicates in the followingforming process, is then formed by applying the galvanized nickel to theglass master in the electroforming process.

[0006] The patterns of the nickel master, generally called a pit and aland (or mirror area) respectively, are formed by transcribing on apolycarbonate or PMMA substrate. The stamped duplicate is coated with areflection layer and added a protection layer for preventing thereflection layer from oxidizing.

[0007] In order to read the optical recording medium manufactured in themanner above, the surface of the disc is irradiated to laser beams,which are oscillated with the predetermined frequency and power. Thereis a difference of the intensity of the reflected laser beams between incase the beams are applied to the mirror area and in case to the pit,and a reproducing apparatus (which is capable of only reproducing theoptical recording medium) including a reading part, called the opticalpick-up, recognizes the difference of the intensity of the reflectedbeams as digital information of 0 or 1 so that the digital informationrecorded on the optical recording medium can be reproduced.

[0008] The optical recording medium has developed from the compact disc(audio CD), which is mainly for reproducing the audio contents, andcurrently the compact disc is used for storing the data of a computer ina form of the read-only memory (CD-ROM) or reproducing the audiocontents in a computer equipped with an audio CD driver by addingcomputer-readable information to the audio CD.

[0009] However, as the information recorded on the optical recordingmedium can be read by a reproducing apparatus, for example, a CD-ROMdriver with which an general personal computer is equipped, the contentson the recording medium are not only reproduced, but also illegalcopying of the contents prevails. Therefore, a serious problem how toprotect the copyright of the contents on the recording medium rises.

[0010] Generally, when the audio CD or the CD-ROM is copied, theinformation on the lead-in area, namely TOC (Table Of Contents), such asthe information stored in the recording medium and the predeterminedcontrol information, should be read, so there has been a try to solvethe problem above. That is, according to “CD reproducing control methodwithout TOC” (Korean Patent No. 200879), in order to prevent the illegalcopying of the information on the recording medium by removing the TOCof the CD-ROM or the audio CD and reproduce both the recording mediumprevented from being copied illegally and a general recording medium, itis disclosed that a reproducing control method of a CD without a TOC forpreventing the illegal copying, includes the steps of:

[0011] (1)verifying whether the TOC is read,

[0012] (2)going to a predetermined track and reading information fromthe track, if the TOC is not read in the step (1),

[0013] (3)verifying whether the information, which is read in the step(2), is read from the recording medium without the TOC and

[0014] (4)reading in accordance with a new format if the recordingmedium does not have the TOC, or reading in accordance with a generalformat if the information is from the lead-in area in the step (3).

[0015] According to the method above, However, there is a problem thatit is impossible to reproduce the contents recorded on a copy-protectedrecording medium only with a general reproducing apparatus, because theTOC of the recording medium should be removed artificially, and thereproducing apparatus should be specially programmed and carried out inaccordance with the steps above. That brings users a problem that theyhave to buy an appropriate reproducing apparatus anew besides therecording medium.

DISCLOSURE OF INVENTION

[0016] Therefore, it is an object of the present invention to provide acopy-protected optical recording medium capable of being reproduced by ageneral reproducing apparatus and a method for manufacturing thereof,which is capable of overcoming the above drawbacks accompanying theconventional art. The above and other objects can be achieved bycombinations described in the independent claims. The dependent claimsdefine further advantageous and exemplary combinations of the presentinvention.

[0017] According to the first aspect of the present invention, anoptical recording medium protected from being copied by a generalrecording/reproducing apparatus but capable of being reproduced by ageneral reproducing apparatus, comprises a content session in whichcontent information to be reproduced by the reproducing apparatus isstored and a first and second auxiliary sessions for preventing therecording/reproducing apparatus from copying the content information,wherein the content session comprises control information for guidingthe recording/reproducing apparatus to the first auxiliary sessiontherein, the first auxiliary session comprises control information forguiding the recording/reproducing apparatus to the second auxiliarysession therein, and the second auxiliary session comprises controlinformation for guiding the recording/reproducing apparatus to the firstauxiliary session therein.

[0018] The content session may be an audio session storing audioinformation. The audio session may comprise a lead-in area with aTOC(Table Of Contents), at least one track storing audio contentinformation and a lead-out area, and the control information for guidingthe recording/reproducing apparatus to the first auxiliary session maybe in the TOC of the audio session.

[0019] The control information for guiding the recording/reproducingapparatus may be that a value of “B0” is recorded on a point field of Qsub channel of predetermined one of frames recorded on the lead-in areaof the audio session, and the address of the first auxiliary session isrecorded on absolute time code fields of the Q sub channel on which thevalue of “B0” is recorded.

[0020] Both of the first and second auxiliary sessions may comprise alead-in area with a TOC, at least one auxiliary track and a lead-outarea, the control information for guiding the recording/reproducingapparatus to the second auxiliary session may be in the TOC of the firstauxiliary session, and the control information for guiding therecording/reproducing apparatus to the first auxiliary session may be inthe TOC of the second auxiliary session.

[0021] The control information of the first auxiliary session forguiding the recording/reproducing apparatus may be that a value of “B0”is recorded on a point field of Q sub channel of predetermined one offrames recorded on the lead-in area of the first auxiliary session, andthe address of the second auxiliary session is recorded on absolute timecode fields of the Q sub channel on which the value of “B0” is recorded,while the control information of the second auxiliary session forguiding the recording/reproducing apparatus may be that a value of “B0”is recorded on a point field of Q sub channel of predetermined one offrames recorded on the lead-in area of the second auxiliary session, andthe address of the first auxiliary session is recorded on absolute timecode fields of the Q sub channel on which the value of “B0” is recorded.

[0022] The optical recording medium may further comprise at least onethe content session additionally, wherein each of the content sessionsexcept the last content session may comprise control information forguiding the recording/reproducing apparatus to the next content session,and the last content session may comprise control information forguiding the recording/reproducing apparatus to the first auxiliarysession.

[0023] According to the second aspect of the present invention, a methodfor manufacturing an optical recording medium protected from beingcopied by a general recording/reproducing apparatus but capable of beingreproduced by a general reproducing apparatus, comprises the steps of(a)forming a content session in which content information to bereproduced by the reproducing apparatus is stored and (b)forming a firstand second auxiliary sessions for preventing the recording/reproducingapparatus from copying the content information, wherein controlinformation for guiding the recording/reproducing apparatus to the firstauxiliary session is stored in a predetermined area of the contentsession in the step (a), control information for guiding therecording/reproducing apparatus to the second auxiliary session isstored in a predetermined area of the first auxiliary session in thestep (b), and control information for guiding the recording/reproducingapparatus to the first auxiliary session is stored in a predeterminedarea of the second auxiliary session in the step (b).

[0024] The content session may be an audio session storing audioinformation. The audio session may comprise a lead-in area with aTOC(Table Of Contents), at least one track storing audio contentinformation and a lead-out area, and the control information for guidingthe recording/reproducing apparatus to the first auxiliary session maybe in the TOC of the audio session.

[0025] The control information for guiding the recording/reproducingapparatus may be that a value of “B0” is recorded on a point field of Qsub channel of predetermined one of frames recorded on the lead-in areaof the audio session, and the address of the first auxiliary session isrecorded on absolute time code fields of the Q sub channel on which thevalue of “B0” is recorded.

[0026] Both of the first and second auxiliary sessions may comprise alead-in area with a TOC, at least one auxiliary track and a lead-outarea, the control information for guiding the recording/reproducingapparatus to the second auxiliary session may be in the TOC of the firstauxiliary session, and the control information for guiding therecording/reproducing apparatus to the first auxiliary session may be inthe TOC of the second auxiliary session.

[0027] The control information of the first auxiliary session forguiding the recording/reproducing apparatus may be that a value of “B0”is recorded on a point field of Q sub channel of predetermined one offrames recorded on the lead-in area of the first auxiliary session, andthe address of the second auxiliary session is recorded on absolute timecode fields of the Q sub channel on which the value of “B0” is recorded,while the control information of the second auxiliary session forguiding the recording/reproducing apparatus may be that a value of “B0”is recorded on a point field of Q sub channel of predetermined one offrames recorded on the lead-in area of the second auxiliary session, andthe address of the first auxiliary session is recorded on absolute timecode fields of the Q sub channel on which the value of “B0” is recorded.

[0028] The method for manufacturing an optical recording medium mayfurther comprise a step of forming at least one the content sessionadditionally, wherein each of the content sessions except the lastcontent session may comprise control information for guiding therecording/reproducing apparatus to the next content session, and thelast content session may comprise control information for guiding therecording/reproducing apparatus to the first auxiliary session.

[0029] The summary of the invention does not necessarily describe allnecessary features of the present invention. The present invention mayalso be a sub-combination of the features described above. The above andother features and advantages of the present invention will become moreapparent from the following description of the embodiments taken inconjunction with the accompanying drawings.

BRIEF DESCRIPTION OF DRAWINGS

[0030]FIG. 1 shows the information, of which a session consists,imaginarily placed in a row, and recorded on the audio CD in accordancewith the Red Book Standard.

[0031]FIG. 2 shows the structure of one of frames of which theinformation block recorded on the lead-in area of the information shownin FIG. 1 consists.

[0032]FIG. 3 shows the structure of the Q sub channel of the 8 subchannels consisting of the control information of the frames shown inFIG. 2.

[0033]FIG. 4 shows the information, which is imaginarily placed in arow, recorded on the copy-protected optical recording medium accordingto an exemplary embodiment of the present invention.

[0034]FIG. 5 is a schematic flow chart showing an exemplary embodimentof the method for manufacturing the copy-protected optical recordingmedium according to the present invention.

[0035]FIG. 6 shows the information, which is imaginarily placed in arow, recorded on the copy-protected optical recording medium accordingto another exemplary embodiment of the present invention.

[0036]FIG. 7 is a schematic flow chart showing another exemplaryembodiment of the method for manufacturing the copy-protected opticalrecording medium according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

[0037] The invention will now be described based on the preferredembodiments, which do not intend to limit the scope of the presentinvention, but exemplify the invention. All of the features and thecombinations thereof described in the embodiment are not necessarilyessential to the invention.

[0038] Embodiments of the present invention will be described with theattached drawings by taking a compact disc, a kind of an opticalrecording medium, as an example.

[0039] A standard, which is called “Red Book Standard”, has beenpresented in regard to a format for recording the audio contents, suchas music, on the compact disc. According to the Red Book Standard, theaudio CD has a number of tracks and the tracks are indexed andsystematized. Referring to FIG. 1, FIG. 1 shows the information, ofwhich a session consists, imaginarily placed in a row, and recorded onthe audio CD in accordance with the Red Book Standard. As shown in FIG.1, the audio information recorded on the audio CD includes a lead-inarea, which is first accessed by a reproducing apparatus, a plurality oftracks(track 1 to track N), each of which includes both a pause area anda data area, and a lead-out area, which indicates the end of thesession.

[0040] And also each of the area includes a plurality of informationblocks (which are also called “sectors”), and a block includes 98frames. Each of the frames, of which one of the information blocksrecorded on the lead-in area consists, is composed as shown in FIG. 2.That is to say, a frame, which is recorded on the lead-in area, includessynchronization control information of 3 bytes (Sync), controlinformation of 1 byte (Control), first content data information of 12bytes (Data1), P parity information of 4 bytes (P Parity), secondcontent data information of 12 bytes (Data2) and Q parity information of4 bytes (Q Parity).

[0041] In other words, each of the 98 frames, of which one of theinformation blocks recorded on the lead-in area consists, includes thecontrol information of 1 byte and the control information of 1 byteconsists of 8 sub codes, each of which has information of 1 bit. Each ofthe 8 sub codes is called P, Q, R, S, T, U, V and W field respectively.The sub codes form 8 sub channels, each of which is called P, Q, R, S,T, U, V and W sub channel respectively, over the 98 frames included inone of the information blocks. Each of the sub channels consists of 98bits altogether including 2 synchronization bits and 96 data bits.

[0042]FIG. 3 shows the structure of the Q sub channel of the 8 subchannels consisting of the control information above. Other sub channels(P, R, S, T, U, V and W sub channel) are similar to the Q sub channelbut transfer different information. As shown in FIG. 3, the first 2 bitsof the Q sub channel represent synchronization patterns S0 and S1. Thesynchronization patterns S0 and S1 are used for synchronizing thereproducing apparatus to rotate the recording medium with the constantleaner velocity.

[0043] Following the synchronization patterns S0 and S1, control (Cont)field of 4 bits is recorded, which indicates the number of audiochannels of the contents recorded on the recording medium and theexistence of emphasis, and especially may show whether the contents ofthe track are the audio contents or the data contents storing thecomputer readable information.

[0044] The next 4 bits are address (Adr) field and designate the modefor a format of the Q sub channel. Although mode 1, mode 2, mode 3 etc.,for example, are known as the format of the Q sub channel, only the casethat the address field value is “0001”, that is, the format mode is mode1, will be described here as an example (if the Q sub channel has theformat of mode 1, it has a structure like the format shown in FIG. 3).

[0045] Track number (TNO) field follows the address field. 8 bitsincluded in the track number field has a value of 0 to 99 represented inBinary Coded Decimal (BCD) of the second order. Although the valuegenerally indicates the number of the track, the track, where the tracknumber field has a value of “00”, is the lead-in track, and the track,where the track number field has a value of “AA”, is the lead-out track.

[0046] Next, point (Point) field is generally used for indicating thecontents by dividing in further detail, represented by the track number,and in this case 8 bits included in the point field has a value of 0 to99 and indicates the index number in the track. Moreover, in this casethree fields indicating an absolute time code of the fields of the Q subchannel shown in FIG. 3, namely, absolute minute (AMin), absolute second(ASec) and absolute frame (Afrm) field respectively have the absolutetime values of the track. Here, the absolute time value means the timeinterval within which the content is reproduced from the first track tothe track concerned during the reproduction of the overall recordingmedium, and the absolute time value is called “address” especially incase of the compact disc. It is because the absolute time value can beused as the information about what address in the recording mediumcertain information is recorded at.

[0047] The values of the Q sub channel and the absolute time code,however, may be used as a different meaning. That is, the value recordedon the absolute time code field (the absolute minute, the absolutesecond and the absolute frame field), indicates the number of the firsttrack of the session, if the point field included in the Q sub channelof the lead-in area has a value of “A0”. Meanwhile, the value recordedon the absolute time code field indicates the number of the last trackof the session, if the point field has a value of “A1”, and the valuerecorded on the absolute time code field indicates the address oflead-out area of the session, if the point field has a value of “A2”.Particularly, the value recorded on the absolute time code fieldindicates the address of the next session, if the point field has avalue of “B0”, and the value recorded on the absolute time code fieldindicates the address of the first session of the recording medium, ifthe point field has a value of “C0”.

[0048] Following the point field, the three fields, minute (Min), second(Sec) and frame (Frm), having the information of 8 bits respectively arerecorded as the relative time code fields of the track. The three fieldsindicate the relative time code of the track in the session.

[0049] Following the three fields, zero (Zero) field is included infront of the absolute time code fields. Finally, following the absolutetime code fields, crc (CRC) field of 8 bits for error control isincluded.

[0050] Accordingly, by interpreting the information of the Q sub channelof the lead-in area, the reproducing apparatus for the optical recordingmedium is capable of judging which content is recorded, in which format,at which position on the recording medium and how much quantity of thecontent.

[0051] Therefore, by manipulating the information of the Q sub channel,it is possible not to provide the information required to copy thecontent without influencing the normal reproducing operation of thereproducing apparatus.

[0052]FIG. 4 shows the information, which is imaginarily placed in arow, recorded on the copy-protected optical recording medium accordingto an exemplary embodiment of the present invention. In the exemplaryembodiment shown in FIG. 4, the present invention is applied to theaudio CD. As shown in FIG. 4, the copy-protected audio CD according tothe present invention includes an audio session 100 in which the audiocontents are stored, and further includes a first auxiliary session 102and a second auxiliary session 104 for preventing the copy. The firstand second auxiliary sessions 102 and 104 are arranged to store thecontrol information for controlling the operation of the reproducingapparatus.

[0053] According to the embodiment, the audio session 100 includes alead-in area with a TOC, a plurality of tracks (track 1 to track N) inwhich the audio content information is stored and a lead-out area.

[0054] Both first and second auxiliary sessions 102 and 104 include alead-in area with a TOC, a first auxiliary track, a second auxiliarytrack and a lead-out area. The users can store certain information inthe first and second auxiliary tracks as he or she wishes.

[0055] On the lead-in area of the audio session 100 with the TOC havingthe general structure, the control information for reproducing each oftracks (track 1 to track N) included in the audio session 100 isrecorded. In the copy-protected audio CD according to the presentinvention, however, the control information guiding therecording/reproducing apparatus (not shown in drawing) to the firstauxiliary session 102 is included in the TOC of the audio session 100.

[0056] The recording/reproducing apparatus is generally used, installedin the general computer system, and may be a CD-ROM driver. When therecording/reproducing apparatus understands the structure of theinformation recorded on the general optical recording medium, reads theinformation and extracts to copy, the recording/reproducing apparatus iscontrolled by the information recorded on the TOC.

[0057] The control information controlling the recording/reproducingapparatus is easily embodied by recording the value of “B0” onto thepoint field of the Q sub channel included in predetermined one of theframes recorded on the lead-in area of the audio session 100 and theaddress of the first auxiliary session 102 onto the absolute time codefields corresponding thereto.

[0058] Furthermore, in the audio CD according to the present inventionthe control information guiding the recording/reproducing apparatus tothe second auxiliary session 104 is included in the TOC of the firstauxiliary session 102. This control information, in the similar wayabove, is easily embodied by recording the value of “B0” onto the pointfield of the Q sub channel included in predetermined one of the framesrecorded on the lead-in area of the first auxiliary session 102 and theaddress of the second auxiliary session onto the absolute time codefields corresponding thereto.

[0059] Furthermore, in the audio CD according to the present inventionthe control information guiding the recording/reproducing apparatus tothe first auxiliary session 102 is included in the TOC of the secondauxiliary session 104. This control information, in the similar wayabove, is easily embodied by recording the value of “B0” onto the pointfield of the Q sub channel included in predetermined one of the framesrecorded on the lead-in area of the second auxiliary session 104 and theaddress of the first auxiliary session onto the absolute time codefields corresponding thereto.

[0060] Therefore, as the audio CD according to the present invention isinserted into the general audio reproducing apparatus (not shown indrawing), the reproducing apparatus normally reproduces the tracks(track 1 to track N) included in the audio session of the audio CD.

[0061] As the audio CD according to the present invention is insertedinto the recording/reproducing apparatus, however, in order to copy theCD, the recording/reproducing apparatus understands the structure of theaudio session 100 by reading the TOC of the audio session 100, then isleaded to the first auxiliary session 102, understands the structure ofthe first auxiliary session 102 by reading the TOC of the firstauxiliary session 102, then is leaded to the second auxiliary session102, understands the structure of the second auxiliary session 104 byreading the TOC of the first auxiliary session 102 and then is leaded tothe first auxiliary session 102 again.

[0062] Therefore, the recording/reproducing apparatus reads the firstauxiliary session 102 and the second auxiliary 104 repeatedly withoutend, so it cannot understand the structure of the audio CD according tothe present invention in the end. This operation flow is shown in FIG. 4with dashed lines.

[0063] In other words, the reproducing apparatus generally reproducesthe audio information in disregard of the first auxiliary session 102and the second auxiliary session 104 after the audio session 100 withoutany operation, even if it accesses the TOC of the recording medium.Therefore, only the audio session 100 on which the audio information isrecorded is reproduced.

[0064] Meanwhile, the recording/reproducing apparatus such as a CD-ROMdriver installed and operating in the computer system is capable ofreading various types of information besides the audio information andis made for reading even the information including a number of sessions,but it, by manipulating the control information mentioned above, readsthe first and second auxiliary session 102 and 104 repeatedly withoutend, so it cannot understand the structure of the audio CD according tothe present invention.

[0065] The manipulation of the control information guiding the controlflow above does not give any effect on the reproduction of thecopy-protected audio CD according to the present invention by thereproducing apparatus due to the accordance with the Red Book Standard.Therefore, any problem does not arise on reproducing the audio CDaccording to the present invention by the general reproducing apparatus,which is known widely.

[0066] In case, however, of copying the information on the audio CD withthe general recording/reproducing apparatus, the generalrecording/reproducing apparatus falls into the condition in which itcannot understand the information structure of the audio CD according tothe present invention. Consequently, it fails to work to understand theinformation structure of the audio CD so that it is impossible to copythe contents recorded on the audio CD.

[0067] Next, an exemplary embodiment of the method for manufacturing thecopy-protected optical recording medium according to the presentinvention will be described in detail below with FIG. 5. FIG. 5 is aschematic flow chart showing the exemplary embodiment of the method formanufacturing the copy-protected optical recording medium according tothe present invention. As shown in FIG. 5, the manufacturing process ofthe copy-protected optical recording medium first starts (step 500), apre-process is completed by the known method, and the content session onwhich the contents such as the audio contents are recorded is formed(step 502). According to this embodiment, the audio session 100 isformed in this step 502.

[0068] Particularly, in this step 502, it is included that theinformation guiding the recording/reproducing apparatus to the firstauxiliary session is stored in a predetermined area of the contentsession (step 5022). According to this embodiment, the informationguiding the recording/reproducing apparatus to the first auxiliarysession 102 is included in the TOC of the audio session 100 in the step5022.

[0069] The first auxiliary session then is formed (step 504). Accordingto this embodiment, the first auxiliary session 102 is formed in thisstep 504. Particularly, in this step 504, it is included that theinformation guiding the recording/reproducing apparatus to the secondauxiliary session is stored in a predetermined area of the firstauxiliary session (step 5042). According to this embodiment, theinformation guiding the recording/reproducing apparatus to the secondauxiliary session 104 is included in the TOC of the first auxiliarysession 102 in the step 5042.

[0070] The second auxiliary session then is formed (step 506). Accordingto this embodiment, the second auxiliary session 104 is formed in thisstep 506. Particularly, in this step 506, it is included that theinformation guiding the recording/reproducing apparatus to the firstauxiliary session is stored in a predetermined area of the secondauxiliary session (step 5062). According to this embodiment, theinformation guiding the recording/reproducing apparatus to the firstauxiliary session 102 is included in the TOC of the second auxiliarysession 104 in the step 5062.

[0071] Following the step 506, the post-process, which is known, isperformed in respect of the method for manufacturing the copy-protectedoptical recording medium according to the present invention.

[0072] Meanwhile, due to the recent commercialization of the computerrecordable optical recording medium, it is surely possible to preventthe illegal copying of the recorded information by performing the methodaccording to the present invention when recording the information in themedium.

[0073] Next, another embodiment of the present invention with FIG. 6will be described in detail below. FIG. 6 shows the information, whichis imaginarily placed in a row, recorded on the copy-protected opticalrecording medium according to another exemplary embodiment of thepresent invention. In this exemplary embodiment shown in FIG. 6, thepresent invention is applied to the audio CD including a number of theaudio sessions. As shown in FIG. 6, the copy-protected audio CDaccording to the present invention includes a plurality of audiosessions 100.1, 100.2 . . . 100.n in which the audio contents arestored, and further includes a first auxiliary session 102 and a secondauxiliary session 104 for preventing the copy. The audio sessions 100.1,100.2 . . . 100.n include lead-in areas with TOCs, a plurality of tracksin which the audio content information is stored and lead-out areas.Moreover, both first and second auxiliary sessions 102 and 104 include alead-in area with a TOC, a first auxiliary track, a second auxiliarytrack and a lead-out area.

[0074] On each of the lead-in areas of the audio sessions 100.1, 100.2 .. . 100 .n with the TOCs having the general structure, the controlinformation for reproducing each of tracks (not shown in drawing)included in the audio sessions 100.1, 100.2 . . . 100.n is recorded. Inthe copy-protected audio CD according to this embodiment, however, thecontrol information guiding the reproducing apparatus and therecording/reproducing apparatus to the next session is included in eachof the TOCs of the audio sessions 100.1, 100.2 . . . 100.(n-1) exceptthe last audio session 100.n. the control information guiding therecording/reproducing apparatus to the first auxiliary session 102 isincluded in the TOC of the last audio session 100.n.

[0075] The control information is easily embodied by recording the valueof “B0” onto the point field of the Q sub channel included inpredetermined one of the frames recorded on each of the lead-in areas ofthe audio sessions 100.1, 100.2 . . . 100.n and the next audio sessionor the address of the first auxiliary session onto the absolute timecode fields corresponding thereto.

[0076] Furthermore, also in the audio CD according to this embodimentthe control information guiding the recording/reproducing apparatus tothe second auxiliary session is included in the TOC of the firstauxiliary session 102. This control information is also easily embodiedby recording the value of “B0” onto the point field of the Q sub channelincluded in predetermined one of the frames recorded on the lead-in areaof the first auxiliary session 102 and the address of the secondauxiliary session onto the absolute time code fields correspondingthereto.

[0077] Furthermore, also in the audio CD according to this embodiment,the control information guiding the recording/reproducing apparatus tothe first auxiliary session is included in the TOC of the secondauxiliary session 104. This control information is also easily embodiedby recording the value of “B0” onto the point field of the Q sub channelincluded in predetermined one of the frames recorded on the lead-in areaof the second auxiliary session 104 and the address of the firstauxiliary session onto the absolute time code fields correspondingthereto.

[0078] Therefore, as the audio CD according to the present invention isinserted into the recording/reproducing apparatus, therecording/reproducing apparatus operates toward the first auxiliarysession 102 through the audio sessions 100.1, 100.2 . . . 100.n, thentoward the second auxiliary session 104 and then repeatedly between thefirst auxiliary session 102 and the second auxiliary session 104 withoutend. This operation flow is shown in FIG. 6 with dashed lines.

[0079] Therefore, also in this embodiment, the manipulation of thecontrol information guiding the operation flow above does not give anyeffect on the reproduction of the copy-protected audio CD according tothe present invention by the reproducing apparatus due to the accordancewith the Red Book Standard, while only in case of copying the contentsin the audio CD the recording/reproducing apparatus falls into thecondition in which it cannot understand the structure of the original CDso that it is impossible to copy the contents recorded on the audio CD.

[0080] Next, another exemplary embodiment of the method formanufacturing the copy-protected optical recording medium according tothe present invention will be described in detail below with FIG. 7.FIG. 7 is a schematic flow chart showing another exemplary embodiment ofthe method for manufacturing the copy-protected optical recording mediumaccording to the present invention. As shown in FIG. 7, themanufacturing process of the copy-protected optical recording mediumfirst starts (step 700), a pre-process is completed by the known method,and the content sessions on which the contents such as the audiocontents are recorded are formed (step 702). According to thisembodiment, the audio sessions 100.1, 100.2 . . . 100.n are formed inthis step 702.

[0081] Particularly, in this step 702, it is included that theinformation guiding the reproducing apparatus and therecording/reproducing apparatus to the next content session is stored ina predetermined area of each of the content sessions except the lastcontent session (step 7022). Moreover, the method includes a step ofrecording the information guiding the recording/reproducing apparatus tothe first auxiliary session in a predetermined area of the N-th contentsession in the step 700 (step 7024). According to this embodiment, theinformation guiding the recording/reproducing apparatus to the nextaudio session is included in the TOCs of the audio sessions 100.1, 100.2. . . 100.n in the step 7022, and the information guiding therecording/reproducing apparatus to the first auxiliary session 102 isincluded in the TOC of the last audio session 100.n in the step 7024.

[0082] The first auxiliary session then is formed (step 704). Accordingto this embodiment, the first auxiliary session 102 is formed in thisstep 704. Particularly, in this step 704, it is included that theinformation guiding the recording/reproducing apparatus to the secondauxiliary session is stored in a predetermined area of the firstauxiliary session (step 7042). According to this embodiment, theinformation guiding the recording/reproducing apparatus to the secondauxiliary session 104 is included in the TOC of the first auxiliarysession 102 in the step 7042.

[0083] The second auxiliary session then is formed (step 706). Accordingto this embodiment, the second auxiliary session 104 is formed in thisstep 706. Particularly, in this step 706, it is included that theinformation guiding the recording/reproducing apparatus to the firstauxiliary session is stored in a predetermined area of the secondauxiliary session (step 7062). According to this embodiment, theinformation guiding the recording/reproducing apparatus to the firstauxiliary session 102 is included in the TOC of the second auxiliarysession 104 in the step 7062.

[0084] Following the step 706, the post-process, which is known, isperformed in respect of the method for manufacturing the copy-protectedoptical recording medium according to the present invention.

[0085] Although the present invention has been described by way ofexemplary embodiments, it should be understood that those skilled in theart might make many changes and substitutions without departing from thespirit and the scope of the present invention which is defined only bythe appended claims.

[0086] [Industrial Applicability]

[0087] According to the present invention, it is possible to provide acopy-protected optical medium capable of being reproduced without anadditional reproducing apparatus and a method for manufacturing thereof.

1. An optical recording medium protected from being copied by a generalrecording/reproducing apparatus but capable of being reproduced by ageneral reproducing apparatus, comprising: a content session in whichcontent information to be reproduced by said reproducing apparatus isstored; and a first and second auxiliary sessions for preventing saidrecording/reproducing apparatus from copying said content information,wherein said content session comprises control information for guidingsaid recording/reproducing apparatus to said first auxiliary sessiontherein, said first auxiliary session comprises control information forguiding said recording/reproducing apparatus to said second auxiliarysession therein, and said second auxiliary session comprises controlinformation for guiding said recording/reproducing apparatus to saidfirst auxiliary session therein.
 2. An optical recording medium asclaimed in claim 1, wherein said content session is an audio sessionstoring audio information.
 3. An optical recording medium as claimed inclaim 2, wherein said audio session comprises a lead-in area with aTOC(Table Of Contents), at least one track storing audio contentinformation and a lead-out area, and said control information forguiding said recording/reproducing apparatus to said first auxiliarysession is in said TOC of said audio session.
 4. An optical recordingmedium as claimed in claim 3, wherein said control information forguiding said recording/reproducing apparatus is that a value of “B0” isrecorded on a point field of Q sub channel of predetermined one offrames recorded on said lead-in area of said audio session, and theaddress of said first auxiliary session is recorded on absolute timecode fields of said Q sub channel on which said value of “B0” isrecorded.
 5. An optical recording medium as claimed in claim 1, whereinboth of said first and second auxiliary sessions comprise a lead-in areawith a TOC, at least one auxiliary track and a lead-out area, saidcontrol information for guiding said recording/reproducing apparatus tosaid second auxiliary session is in said TOC of said first auxiliarysession, and said control information for guiding saidrecording/reproducing apparatus to said first auxiliary session is insaid TOC of said second auxiliary session.
 6. An optical recordingmedium as claimed in claim 5, wherein said control information of saidfirst auxiliary session for guiding said recording/reproducing apparatusis that a value of “B0” is recorded on a point field of Q sub channel ofpredetermined one of frames recorded on said lead-in area of said firstauxiliary session, and the address of said second auxiliary session isrecorded on absolute time code fields of said Q sub channel on whichsaid value of “B0” is recorded, while said control information of saidsecond auxiliary session for guiding said recording/reproducingapparatus is that a value of “B0” is recorded on a point field of Q subchannel of predetermined one of frames recorded on said lead-in area ofsaid second auxiliary session, and the address of said first auxiliarysession is recorded on absolute time code fields of said Q sub channelon which said value of “B0” is recorded.
 7. An optical recording mediumas claimed in claim 1, further comprising at least one content sessionin which content information to be reproduced by said reproducingapparatus is stored additionally, wherein each of said content sessionsexcept the last content session comprises control information forguiding said recording/reproducing apparatus to the next contentsession, and said last content session comprises control information forguiding said recording/reproducing apparatus to said first auxiliarysession.
 8. A method for manufacturing an optical recording mediumprotected from being copied by a general recording/reproducing apparatusbut capable of being reproduced by a general reproducing apparatus,comprising the steps of: (a)forming a content session in which contentinformation to be reproduced by said reproducing apparatus is stored;and (b)forming a first and second auxiliary sessions for preventing saidrecording/reproducing apparatus from copying said content information,wherein control information for guiding said recording/reproducingapparatus to said first auxiliary session is stored in a predeterminedarea of said content session in said step (a), control information forguiding said recording/reproducing apparatus to said second auxiliarysession is stored in a predetermined area of said first auxiliarysession in said step (b), and control information for guiding saidrecording/reproducing apparatus to said first auxiliary session isstored in a predetermined area of said second auxiliary session in saidstep (b).
 9. A method for manufacturing an optical recording medium asclaimed in claim 8, wherein said content session is an audio sessionstoring audio information.
 10. A method for manufacturing an opticalrecording medium as claimed in claim 9, wherein said audio sessioncomprises a lead-in area with a TOC(Table Of Contents), at least onetrack storing audio content information and a lead-out area, and saidcontrol information for guiding said recording/reproducing apparatus tosaid first auxiliary session is in said TOC of said audio session.
 11. Amethod for manufacturing an optical recording medium as claimed in claim10, wherein said control information for guiding saidrecording/reproducing apparatus is that a value of “B0” is recorded on apoint field of Q sub channel of predetermined one of frames recorded onsaid lead-in area of said audio session, and the address of said firstauxiliary session is recorded on absolute time code fields of said Q subchannel on which said value of “B0” is recorded.
 12. A method formanufacturing an optical recording medium as claimed in claim 8, whereinboth of said first and second auxiliary sessions comprise a lead-in areawith a TOC, at least one auxiliary track and a lead-out area, saidcontrol information for guiding said recording/reproducing apparatus tosaid second auxiliary session is in said TOC of said first auxiliarysession, and said control information for guiding saidrecording/reproducing apparatus to said first auxiliary session is insaid TOC of said second auxiliary session.
 13. A method formanufacturing an optical recording medium as claimed in claim 12,wherein said control information of said first auxiliary session forguiding said recording/reproducing apparatus is that a value of “B0” isrecorded on a point field of Q sub channel of predetermined one offrames recorded on said lead-in area of said first auxiliary session,and the address of said second auxiliary session is recorded on absolutetime code fields of said Q sub channel on which said value of “B0” isrecorded, while said control information of said second auxiliarysession for guiding said recording/reproducing apparatus is that a valueof “B0” is recorded on a point field of Q sub channel of predeterminedone of frames recorded on said lead-in area of said second auxiliarysession, and the address of said first auxiliary session is recorded onabsolute time code fields of said Q sub channel on which said value of“B0” is recorded.
 14. A method for manufacturing an optical recordingmedium as claimed in claim 8, further comprising a step of forming atleast one content session in which content information to be reproducedby said reproducing apparatus is stored additionally, wherein each ofsaid content sessions except the last content session comprises controlinformation for guiding said recording/reproducing apparatus to the nextcontent session, and said last content session comprises controlinformation for guiding said recording/reproducing apparatus to saidfirst auxiliary session.